I also began to experience problems with battery performance after two years and light use on a E-Z-Go Freedom RXV. So, I did some basic research since my long career in the Army Signal Corps using lead acid batteries had lead me to believe some things that aren't true with modern golf cart batteries.
Below are some industry and specifically, E-Z-Go tips which answer many of the problems described, especially if you believe you shouldn't charge frequently to avoid over charging or limiting the number of charges rated for the life of a particular battery, or the mistaken concept of notorious susceptibility to the "memorization effect" if you constantly charge after light use, and finally, the myth with modern golf cart batteries that you need to deplete battery capacity (through use) to low levels and then perform a complete charge to "reform" the battery capacitance. And of course there are the often fault practices associated with plain old care, which specifically means when to add water, how to add water and whether to add water after charging or as needed. Kyle at T & C told me much of this when I purchased two years ago..but I ignored a lot of it as I was sure my long experience with lead acid batteries trumped his. I've found his and BJ's advice & customer service to be top-notch.
Here are some answers:
Deep Cycle Battery FAQ
Be sure to read Cycles vs Life, Battery Aging, and Mini-Factoids, located toward the bottom of the reference article.
Here is the link provided by E-Z-Go's Battery Maintenance Center:
Battery Charging
At the bottom of each page, keep clicking to step through the tips.
Lastly..ever hear of "Equalization Charge"? I hadn't.
Equalization Charging
Don't be surprised at what you learn as to what you thought. Hope this helps those of you who are frustrated with your golf cart's battery "endurance".